Place it alone after the awkward beat in a reaction edit, then follow it with Ceeday Huh for a confused follow-up or Damn for a stronger response to the same moment.
このサウンドについて
This is a single short grunt, lasting just over half a second, delivered in a flat, low human voice with no other words around it. It lands as a blunt, unimpressed response, the kind of sound that makes a silly or awkward moment feel funnier because it says so little. It works best as a deadpan reaction to something strange, confusing or unexpectedly disappointing.